Castel Del Monte (the castle of the mount) sits high on a hill overlooking Apulia in Italy. It was built in the 13th Century by Frederick II, the Holy Roman Emporer as part of a series of defensive castles. It is Octagonal in shape with octagonal towers, a unique design of its time. It is now recognised as a Unesco World Heritage site

Inside the Castle. Photo by Irene Grassi (https://www.flickr.com/photos/sun_sand_sea/)